Respostas

2013-10-28T12:08:33-02:00
(2a+9)² = (2a)²+2.2a.9+9² = 4a²+36a+81
(x³+1)² = (x³)²+2.x³.1+1² = x^6+2x³+1
(n+2)² = n²+2.n.2+2² = n²+4n+4
(30+2)² = 30²+2.30.2+2² = 900+120+4=1024
2 5 2